3 papers
quant-ph2008★ 97 cited
Direct observation of quantum criticality in Ising spin chains
Jingfu Zhang, Fernando M. Cucchietti, C. M. Chandrashekar +6
We use NMR quantum simulators to study antiferromagnetic Ising spin chains undergoing quantum phase transitions. Taking advantage of the sensitivity of the systems near criticality…
quant-ph2008★ 70 cited
Quantum Fidelity and Thermal Phase Transitions
H. T. Quan, F. M. Cucchietti
We study the quantum fidelity approach to characterize thermal phase transitions. Specifically, we focus on the mixed-state fidelity induced by a perturbation in temperature. We co…
quant-ph2006★ 12 cited
Gaussian Decoherence and Gaussian Echo from Spin Environments
W. H. Zurek, F. M. Cucchietti, J. P. Paz
We examine an exactly solvable model of decoherence -- a spin-system interacting with a collection of environment spins. We show that in this simple model (introduced some time ago…